The Mayor's Office on Volunteerism, Serve DC is encouraging residents to commemorate the September 11th National Day of Service and Remembrance and pay tribute to men and women in uniform by giving back. On behalf of Blue Star Families and Operation Honor Cards, Serve DC is hosting "#ThankUniforms," an outreach campaign that calls on District residents to pledge and fulfill service hours to honor the service of first responders, military service members, veterans, and their families.